The multiple choice questions have five answer choices — one (and only one) is correct in each case.
In a breeding experiment using gray and white mice of unknown genotypes, the following results were obtained.
If the gray female from cross IV were mated with the gray male from cross II, then which of the following would most likely be true?
Select an Answer
All of the offspring would be gray.
All of the offspring would be white.
Half of the offspring would be gray.
One-quarter of the offspring would be gray.
One-quarter of the offspring would be white.
In cross IV, the gray female parent must be homozygous dominant. In cross II, the gray male parent must be heterozygous. Therefore, all of the offspring from this cross would show the dominant phenotype, gray, choice (A).